diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testUndefinedPropertyAccess.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testUndefinedPropertyAccess.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,12 @@
+function testUndefinedPropertyAccess() {
+    var x = [1,2,3];
+    var y = {};
+    var a = { foo: 1 };
+    y.__proto__ = x;
+    var z = [x, x, x, y, y, y, y, a, a, a];
+    var s = "";
+    for (var i = 0; i < z.length; ++i)
+        s += z[i].foo;
+    return s;
+}
+assertEq(testUndefinedPropertyAccess(), "undefinedundefinedundefinedundefinedundefinedundefinedundefined111");